Alien (エイリアン,Eirian?) is the final boss from Mega Man 2. When the player enters his room, Dr. Wily will jump from his flying saucer and turn into a green alien. Its only weakness is Bubble Lead, and all other weapons refill all its energy when used against it. The Alien shoots and flies slowly throughout the room, always in a figure eight pattern. When it's defeated, it is revealed that it was just a hologram created by Dr. Wily to trick Mega Man, and the "alien" was a small flying object.

The Alien appears near the end of the mini game "Tatakae! Rockman" in Pokeroku 2. He warps between the three paths and attacks with either a series of 4 arrow-shaped projectiles that can be destroyed with one shot (each worth 1 point) or an indestructible sphere. When the Alien's health is equal or lower than 8, it will stop attacking and warp faster, making him a harder target. Defeating the Alien is optional, as he will escape when Mega Man reaches the end of the path, but his defeat will grant the player 20 points and end the mini game. As each Charge Shot causes 10 damage to the Alien, it is recommended to defeat him only with them as he will be defeated with 8 hits instead of 80 normal shots (which is probably impossible due to the limited time) and will not warp due to the low health.

* Any data with a "+" represents the weapon actually restoring the boss's health.

Other media

In Archie Comics' Mega Man comic series, Dr. Wily tries to fool Mega Man with the Alien hologram, saying he came from space. Mega Man is confused at first, but he discovers that the Alien is a decoy and destroys the hologram's source, revealing the position of the real Dr. Wily.